332-333 / 620
Nominal Carnitine (µg/L) Recovery% (Avg. 3 days)
RSD,%
Sample weights used:
3.45 (50% WS1)
101.2
1.8
6.89
99.3
1.2
(g)
17.2
100.3
1.1
34.5
100.0
1.5
5.0
of 10% w/w recon
51.7
99.4
0.7
4.3
of 10% w/w recon
68.9
100.1
1.5
3.7
of 10% w/w recon
3.9
of 10% w/w recon
4.1
of 10% w/w recon
Nominal Choline (µg/L) Recovery% (Avg. 3 days)
RSD,%
4.1
of 10% w/w recon
7.5
of 10% w/w recon
29.7
100.3
2.0
2.7
of 10% w/w recon
59.3
99.6
1.7
3.7
of 10% w/w recon
119
100.3
2.2
3.0
as is
237
99.3
1.4
0.8
as is
356
100.1
2.4
0.6
as is
510
99.4
1.1
raw results for powders were calculated per g powder, then converted
later to SPIFAN RTF basis (multiplying by 0.1111)
WS1 std conc:
~30 µg/L choline
~ 8 µg/L
carnitine
this caused problems with recovery
WS2 std conc:
150 µg/L choline
40 µg/L
carnitine
Typical RTF dilution factor: 3500x for a 1 g sample; 1250 for a 3 g sample of RTF
Typical powder dilution factor: 8500 x for a 4g sample of a 10% recon
WS3 std conc:
300 µg/L choline
80 µg/L
carnitine
Note: these concentrations were extended to perform overspike studies
the Adult Milk Pwd had to be weighed at an especially high size, because it had almost
no choline/carnitine
SPIFAN IFPwd Milk-P Hydro
Product Name
SRM1849a
SPIFAN IFPwd Milk
SPIFAN IFPwd Soy
Perative RTF
TwoCal HN RTF
SPIFAN IFPwd Soy P Hydro
Vital HNPwd
SPIFAN Adult Pwd Milk
Child Formula Pwd
Infant Elemental Pwd
SPIFAN IF RTF Milk
Carn-05 MEF Form
FOR ERP USE ONLY
DO NOT DISTRIBUTE